package designpattern.visitor.old;

/**
 * 每次扩展功能都需要修改已经存在的类
 */
public abstract class Consumer {

    private String id;

    private String name;

    //
    public abstract void Request1();

    //扩展功能
    public abstract void Request2();

    //扩展功能
    public abstract void Request3();

}
